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3 years ago

Radioactive isotopes are used to treat cancer true or false

Physics

1 answer:

Nataly [62]3 years ago

8 0

Yes, radioactive isotopes are used to treat cancer by doing special x-ray kind of things.

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The image formed by a convex lens is 5.0 cm from the midline. The image is 10.0 cm in height. If the object is 2.0 cm tall, wher

bezimeni [28]

Answer:

1.0 cm from the lens

Explanation:

8 0

3 years ago

A moving coil meter has a resistance of 25 and indicate full scale deflection when a current of 4.0mA flows through it.How could

amm1812

GivenG=25,lg=10mA=10×10 power by 3A,v=100V
To find resistance(Rs)
Formula R
′
s=
lg−G
V

Calculations by formula
R
′
s=
(10×10
−3
−25
100

=10000−25
=9975
Ans- resistance by 9975Ω

6 0

2 years ago

A helium balloon containing 5m³ of gas at a pressure of 30kPa is released into the air. Assuming that the temperature is constan

Minchanka [31]

Answer:

30 m³

Explanation:

Parameters given:

Initial volume of helium, V1 = 5 m³

Initial pressure in balloon, P1 = 30 kPa

Final pressure, P2 = 5 kPa

To find the volume of the balloon at that volume, we apply Boyle's law.

It states that at constant temperature, the pressure of a gas is inversely proportional to the volume of the gas.

Mathematically:

P = k / V

Where k = constant of proportionality

This implies that:

P * V = k

This means that if the pressure or volume of the gas changes at the same temperature, the product of the pressure and volume would be the same:

Hence:

P1 * V1 = P2 * V2

Hence, to find the final volume:

30 * 5 = 5 * V2

=> V2 = (30 * 5) / 5

V2 = 30 m³

The volume of the gas when the pressure is 5 kPa is 30 m³.

6 0

3 years ago

State the dimension of surface tension

Luda [366]

Answer:

Actually, surface tension is the to force per unit length. That means formula for surface tension is = force/length . As we know that the dimensional formula for length is L . And that for force is MLT^-2. So the dimensional formula for surface tension can be obtained by dividing the dimensional formula of force and length.

Explanation:

3 0

3 years ago

An average sleeping person metabolizes at a rate of about 80 W by digesting food or burning fat. Typically, 20% of this energy g

Leto [7]

Answer:

Explanation:

The Power generated by metabolizing food = 80 W

The watt W is equivalent to the Joules per sec J/s

therefor power = 80 J/s

20% of this energy is not used for heating, amount available for heating is

==> H = 80% of 80 = 0.8 x 80 = 64 J/s

The inner body temperature = 37 °C = 273 + 37 = 310 K

The entropy of this inner body ΔS = ΔH/T

ΔS = 64/310 = 0.2065 J/K-s

The skin temperature is cooler than the inner body by 7 °C

Temperature of the skin = 37 - 7 = 30 °C = 273 + 30 = 303 K

The entropy of the skin = ΔS = ΔH/T

ΔS = 64/303 = 0.2112 J/K-s

change in entropy of the person's body = (entropy of hot region: inner body) - (entropy of cooler region: skin)

==> 0.2065 - 0.2112 =<em> -4.7 x 10^-3 J/K-s</em>

8 0

3 years ago